Counterboring-tool



C. W. LIPEI COUNTERBORING TOOL.

APPLICATION FILED MAY I3. 1920- Patented Aug. 16, 1921.

2 E R u n F FIGURE 1 5 E R u B F 4 E R u m F FIGURE 5 INVENTOR M@r/% A'r'roRwY UNITED STATES PATENT OFFICE.

CHARLES W. LIPE, OF SAN JOSE, CALIFORNIA.

GOUNTERIBORING-TOOL.

To all whom it may concern:

c it known that I, CHARLES 1V. LIPE, a citizen of the United States, and resident of San Jose, in the county of Santa Clara and State of California, have invented certain new and useful Improvements in Counterboring-Tools, of which the following is a specification.

My invention relates to a tool for working upon metal surfaces difficult of access and particularly for counter-boring valve seats.

It is the object of my invention to provide a tool of the character indicated which can be readily inserted through an opening of given diameter and then extended to contact with the metal to be worked, and finally locked in an extended position. Further objects are to provide a simple and accurate means of gaging the extension of the cutting elements, and simple and easily operated means for effecting the extension and withdrawal of the cutting elements.

In the drawing Figure 1 is a side elevation of my invention in an operative position, one half thereof being in section.

Fig. 2 is a section on line 2--2 of Fig. 1.

Fig. 3 is a section on line 33 of Fig. 1.

Fig. 4 is a section on line 4-4 of Fig. 1.

Fig. 5 is a detail diagrammatic view illustrating the application of the invention forming the subject matter of this application.

Referring more particularly to the drawing, 1 indicates a tubular shaft or handle provided with an outwardly extending flange at one end and a recess 3 concentrically positioned with relation thereto. Axially arranged with relation to shaft 1 and secured thereto by screws 4 is a member 5 provided with a pair of parallelly arranged slots 6 and 7 extending from side to side of said member as shown, each slot having a bar as 8 and 9 slidably mounted therein and preferably extending throughout the'length thereof.

Each bar is provided with a cutting edge as at 10 and 11 and in some instances also at 12 and 13 respectively. These bars are normally nested in their respective slots but are extended therefrom by pins 14 and 15 set in the face of head 16 of shaft 17 and engaging, respectively, slots 18 and 19 arranged in bars 6 and 7 as shown and on opposite sides of the axis thereof.

Head 16 rotates snugly in recess 3 and Specification of Letters Patent.

Patented Aug. 16, 1921. 1920. Serial No. 381,071.

shaft 17 extends through tube 1 and out the other end thereof. Upon this end of tube 1 is formed a hexagonal surface 20 for applying a wrench to the device, and a wide flange 21 tapped to engage handles 22 and carrying an upwardly extending narrow flange 23. Mounted to rotate On flange 23 is a collar 24 having an upper portion 25 extending over the upper edge of flange 23 and provided with a knurled gripping surface 26. In the upper edge of this collar 24 is formed a slot 27 of suitable length as shown and at 28 is shown a clutch secured to member 21 by a screw 29 so that the collar 24 may be held in a given position on flange 23 by tightening screw 29 thereby causing clutch 28 to grip both members 21 and 24.

At 30 is shown an operating head provided with a central orifice 31 adapted to slidably engage shaft 17 and operably connected to the same by a keyway and key 32. Head 30 is seated upon member 21 as shown at 33 and engages the inner edge of flange 23 as shown at 34, the upper portion of head 30 extending over member 24 to the outer edge thereof as shown at 35 and having a pin 36 positioned on the under surface of this portion 35 adapted to operate in slot 27 of collar 24.

At 37 is shown a nut tapped to engage the threaded end of shaft 17. When nut 37 is loosened shaft 17 may be rotated by turning member 30. but when the nut is tightened against member 30 all of the movable parts are locked in position.

As an illustration of one use of the device I have shown at 38 a portion of an engine with a valve seat at 39 and the bearing for the valve stem at 40. Before wearing the exhaust is discharged directly from the cylinder over the seat 39. But as the seat is re ground from time to time it reaches continually a position such as shown in dotted lines at 41. Now the exhaust at each discharge must work around shoulder 42 thereby causing improper working of the valve and im perfect exhaust so that the same rapidly becomes worn and distorted and the seat needs regrinding. Now. if the shoulder is cut away each time after rcgrinding as shown in dotted lines at 43 then the burnt gases will have as free passage after many regrindings of the valve seat as before regrinding was necessary.

In adjusting my improved counter-boring tool for cutting the shoulder 43 the distance which bars 8 and 9 are to be extended is first measured and the said bars extended the required distance by turning member 30 in a clockwise direction. The collar 24 is now turned contra-clockwise until the end of slot 27 engages pin 36 on member 30 and the screw 29 tightened until clutch 28 grips both members 24 and 21. The member 30 is now turned contra-clockwise to retract bars 8 and 9 and the device placed in position through opening-a l, the latter being of substantially the same size as the valve seat 39. Before inserting, however, a rod &5 is screwed into the lower end of the device as at46, this rod 45 engaging bearing 40 and centering the device on the work.

The tool being in position member 30 is again turned in a clockwise direction until pin 36 engages the end of slot 27, whereupon nut 37 is screwed down tightly against menr ber 30'thereby locking the same. and shaft 17 and bars 8 a1'1d9 in position. The loosening-of nut 37 permits the retracting of the bars 8 and 9 and the withdrawal of the tool.

It is to be understood, of course, that the tool once set for a given sized valve does not require resetting for other yalves of equal slze, and the whole devlce 1s rotated to bring cutting edges 11 into operat on by using handles 22 or applying a wrench to part 20. The rod i5 may be changed for one of another diameter to fit a different sized bearing 40 when necessary. It is also understood that changes inform, size, tails of construction and method of operation may be made within the scope of the appended claims.

1. A tool of the character indicated comprising a tubular supporting member, a shaft revolubly mounted therein, laterally movable cutting 7 elements operatively connected to said shaft and adjustable thereby, means for rotating said shaft in said member, and means for locking said last mentioned means and said member against rotating with respect to each other.

2. A tool of the character indicated comprising a tubular supporting member, a

shaftrevolubly' mounted therein, laterally movable cutting elements operatively connected to saidsha-ft and adjustable thereby, means for rotating said shaftin said member, .means for limitingthe rotat-ive movement of said means and said shaft, and means for locking, said first mentioned means, said, shaft and said last mentioned means against rotating relative to said member.

Sl A tool of the character indicated com prising atubular supporting member, a

shaft revolubly mounted therein, laterally movable cutting; elements operatively cone means for rotating said shaft in said menr ber, means for limiting the rotative movement of said means and said shaft means for locking said last mentioned means against movement with relation-to said-tubular member, and means for locking said first mentioned means against rotative movement relative to said tubular member.

5. A tool of the character indicated-comprising a tubular supporting member, a shaft revolubly mounted therein, laterally movable cutting elements operatively connected to said shaft and adjustable thereby, means for rotating said shaft in said. member, means for locking said last mentioned means and said member against rotating with respect toeach other, and a pin mounted in said member in axial alinement there with for centering the same.

6. A tool of the character indicated comprising a tubular supporting member, a shaft revolubly mounted therein, a pair of bars provided with cutting edges slidably mounted in said member, means whereby said bars are adjustable bysaid shaft, means mounted on said shaft and engaging said member for rotating said shaft, and means forlocking said member an'dsaid last mening a pair of parallel laterally extending slots formed in one end thereof and a recess formed therein communicating with saic slots, a shaft revolubly mounted in said member. a head on oneend of said shaft and engaging said recess, a pair of oppositely disposed pins; set in said head, a pair of bars having cutting edges slidably mounted. in said slots and. provided with slots extending crosswise thereof and engaging said pins, a member slidably mounted upon the other end of said shaft to rotate therewith, means for determining the position of said member with relation to said supporting member, vand meansmounted on said shaft forengagmg said slidable member and lockmg the same to said supper mg member.

enemies w. LIPE. 

